Astrophysical: Magnetic fields

  • Publication
    Properties of the Umbral Filament Observed in Active Region NOAA 12529
    Recent observations of the solar photosphere revealed the presence of elongated filamentary bright structures inside sunspot umbrae, called umbral filaments...
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    Pushing the ground-based limit: 14-μmag photometric precision with the definitive Whole Earth Telescope asteroseismic data set for the rapidly oscillating Ap star HR1217
    HR1217 is one of the best-studied rapidly oscillating Ap (roAp) stars, with a frequency spectrum of alternating even- and odd-l modes that are distorted by the...
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    Puzzling large-scale polarization in the galaxy cluster Abell 523
    Large-scale magnetic fields reveal themselves through diffuse synchrotron sources observed in galaxy clusters such as radio halos. Total intensity filaments of...
  • Publication
    Quiet Sun Magnetic Fields from Simultaneous Inversions of Visible and Infrared Spectropolarimetric Observations
    We study the quiet Sun magnetic fields using spectropolarimetric observations of the infrared and visible Fe I lines at 6301.5, 6302.5, 15648, and 15653 Å...
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    Quiet sun magnetic fields vs. polar faculae - local vs. global dynamo?
    Quiet Sun magnetic fields in the internetwork are almost ubiquitous. Simultaneous observations in infra-red and visible lines and high spatial resolution ( 0.5'...
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    Quiet-Sun inter-network magnetic fields observed in the infrared
    This paper presents the results of an investigation of the quiet Sun's magnetic field based on high-resolution infrared spectropolarimetric observations...
  • Publication
    Quiet-Sun Internetwork Magnetic Fields from the Inversion of Hinode Measurements
    We analyze Fe I 630 nm observations of the quiet Sun at disk center taken with the spectropolarimeter of the Solar Optical Telescope aboard the Hinode satellite...
  • Publication
    Quiet-Sun Magnetic Field Measurements Based on Lines with Hyperfine Structure
    The Zeeman pattern of Mn I lines is sensitive to hyperfine structure (HFS), and because of this, they respond to hectogauss magnetic field strengths differently...
  • Publication
    Quiet-Sun Magnetic Fields at High Spatial Resolution
    We present spectropolarimetric observations of internetwork magnetic fields at the solar disk center. A Fabry-Pérot spectrometer was used to scan the two Fe I...